Solidification behavior of Ni-based superalloy at different cooling rates

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Journal of Materials Research Pub Date : 2024-09-05 DOI:10.1557/s43578-024-01429-y

Shuai He, Zhifeng Li, Chi Zhang, Xin Liu, Chaoyi Wang, Junsheng Wang

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Abstract

The solidification behavior of Ni-based superalloy in the cooling rates range of 0.5–10 °C/s was investigated for simulation the casting process. Scheil model was used to calculate the solidification path of Ni-based superalloy. The results show that the precipitation sequence of solid phases from the liquid phase was as follows: Liquid (L) → L + γ → L + γ + MC → γ + MC + γ/γ′ eutectic. The precipitation temperature of γ/γ′ eutectic was increased with the increase of cooling rate. The solidification structures of Ni-based superalloy were found to be mainly dendritic, and the distance between dendrites decreased with the increase of cooling rate. The MC carbides enriched with C, Ti, Hf, Ta, and other elements presented rectangles, which contributed to refine the solidification structure as the heterogeneous nucleus. The nano-indentation was used to measure the γ + γ′ matrix and MC cabides, and the mechanism of cooling rate on the evolution of microstructure during the solidification was discussed.

Graphical Abstract

The solidification structures of Ni-based superalloy.

Abstract Image

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不同冷却速率下镍基超合金的凝固行为

研究了镍基超耐热合金在 0.5-10 °C/s 冷却速率范围内的凝固行为，以模拟铸造过程。采用 Scheil 模型计算了镍基超耐热合金的凝固路径。结果表明，固相从液相析出的顺序如下：液相 (L) → L + γ → L + γ + MC → γ + MC + γ/γ′ 共晶。γ/γ′共晶的析出温度随冷却速率的增加而升高。镍基超耐热合金的凝固结构以树枝状为主，且树枝间距随冷却速率的增加而减小。富含 C、Ti、Hf、Ta 等元素的 MC 碳化物呈矩形，作为异质晶核有助于细化凝固结构。采用纳米压痕法测量了γ+γ′基体和MC碳化物，并讨论了冷却速度对凝固过程中微观结构演变的影响机制。

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来源期刊

Journal of Materials Research 工程技术-材料科学：综合

CiteScore

4.50

自引率

3.70%

发文量

362

审稿时长

2.8 months

期刊介绍： Journal of Materials Research (JMR) publishes the latest advances about the creation of new materials and materials with novel functionalities, fundamental understanding of processes that control the response of materials, and development of materials with significant performance improvements relative to state of the art materials. JMR welcomes papers that highlight novel processing techniques, the application and development of new analytical tools, and interpretation of fundamental materials science to achieve enhanced materials properties and uses. Materials research papers in the following topical areas are welcome. • Novel materials discovery • Electronic, photonic and magnetic materials • Energy Conversion and storage materials • New thermal and structural materials • Soft materials • Biomaterials and related topics • Nanoscale science and technology • Advances in materials characterization methods and techniques • Computational materials science, modeling and theory